Security advisory

{
  "id": "e5c700e264fb2b99fd34931381c3f11b0e8a9253ef3088e33f0f179a5211e0fa",
  "url": "https://osv.dev/vulnerability/CVE-2021-4252",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-4252",
    "summary": "A vulnerability, which was classified as problematic, has been found in WP-Ban. This issue affects the function toggle_checkbox of the file ban-options.php. The manipulation of the argument $_SERVER[\"HTTP_USER_AGENT\"] leads to cross site scripting. The attack may be initiated remotely. The name of the patch is 13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76. It is recommended to apply a patch to fix this issue. The identifier VDB-216209 was assigned to this vulnerability.",
    "evidence": "osv:CVE-2021-4252",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-4252",
      "aliases": [
        "CVE-2021-4252"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/lesterchan/wp-ban",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4252.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:05.661180238Z",
      "provider": "osv",
      "references": [
        "https://vuldb.com/?id.216209",
        "https://github.com/lesterchan/wp-ban/commit/13e0b1e922f3aaa3f8fcb1dd6d50200dd693fd76",
        "https://github.com/lesterchan/wp-ban/pull/11"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:wp-ban_project:wp-ban:*:*:*:*:*:wordpress:*:*"
            ],
            "vendor_product": "wp-ban_project:wp-ban",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2021-11-24"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-4252",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384854,
  "published_at": "2022-12-18T22:15:10.243+00:00"
}